5 in x 15000 psi Drill stem testing DST Round Mandrel Slip Joint

Original
brand: 5" 105Mpa Round mandrel slip joint-5ft balanced
price: Negotiable
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Total supply:
Delivery term: The date of payment from buyers deliver within days
seat: Beijing
Validity to: Long-term effective
Last update: 2017-11-19 09:20
Browse the number: 285
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Product details

General Description


The slip joint is a telecoping tool with provides an expansion joint in the DST string, allowing for up and down movement of a floating drilling vessel. It's action provides a constant wieght on tools below it.When used below testing tools, it provides free travel when manipulating pipe to reposition mechanical valves during testing.

Slip joints are specifically designed for loating vessels operations such as

  1. Cased Hole Testing

  2. Pressuring Operations with Packers(I.e. Squeezing, testing).



Features

  1. Internal Volume Balance.

  2. Telecoping action

  3. Keyed upper mandrel.

  4. Provide a simple way to maintain the proper amount of weight on tools.



Technical Parameters

No

Specification

5

1

O.D.

127.5mm

2

Bore Diameter

57mm

3

Length

4687mm

4

Stroke Length

1524mm

4

Working pressure

105Mpa

5

Internal pressure strength

129Mpa

6

External pressure strength

120Mpa

7

Tensile strength

1320KN

8

Torque strength

23KN.m

9

Service

H2S,NACE MR0175(>175oF)

10

Working temperature

-29oC+204oC

11

Connection thread

3 7/8CAS. BXP 

Operation 

The basic nature of slip joint operation is that for each foot the pipe lengthens at the slip joint when the vessel moves upward, volume in the pipe increase and a differential piston in the slip joint dispalces the same amount of luid into the pipe. The net result is no change in internal volume.

Downward movement of the vessel reverses the displacement. Where multiple slip joints are used, the top slip joint theoretically will make it's entire ravel before the next one begings, and so on. A slight bump may be noticed on the weight indicator as each slip joint shoulders.

A slip joint can be located by weighing the string as it goes in the hole.When the desired packer setting weight is shown on the weight indicator, plance the slip joint into the testing string.

A pressure test can be performed on the entire 5ft-1.52m length of the sealing mandrel OD.


Certificate

Quality Control

The DST tools manufactured by ZZ Top is full bore type and annular pressure operated, applicable for 4 1/2” to 20” casing, the tools OD is 3 7/8” and 5”, Working pressure upto 105Mpa, working temperature upto 425F.

As per NACE MR0175 standard, the materials ZZ Top used is AISI41XX Alloy steel with hardness in 30HRC in average but also consider the high working pressure to choose high hardness material used in Critical parts i.e. Nitrogen Case, for ball valve, the material is Inconel 718 which import from USA directly. And for strict working condition such as high H2S, CO2, Acid and HCL, we also suggest the material Inconnel

or other high Nickel alloy steel.

For other redress parts like O rings, rupture discs are also optional from US parker and Fike USA, and as per our test Chinese are also in good performance, those parts can be available once request.

Regarding DST tools, the maintenance is very important for each well running, replace all O rings after a job is very necessary to keep tools in well condition, ZZ Top also provide DST maintenance training in user site and in factory.

ZZ Top is running under ISO9001:2008, and all tools were certified by SGS in full process, from material to final function testing.


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